This is a continuation of the discussion about the recent preprint "Lois de réciprocité supérieures et points rationnels" by Colliot-Thélène, Parimala and Suresh (arXiv:1302.2377). Adam Topaz will give an informal presentation concerning the Bloch-Ogus-Kato complex and the Gersten conjecture; these ideas are related to Section 2 of the preprint.